cpufreq: exynos: Use simple approach to asses if cpu cooling can be used

Commit: e725d26c4857e5e41975b5e74e64ce6ab09a7121 provided possibility to
use device tree to asses if cpu can be used as cooling device. Since the
code was somewhat awkward, simpler approach has been proposed.

Test HW: Exynos 4412 - Odroid U3.

Suggested-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>

diff --git a/drivers/cpufreq/exynos-cpufreq.c b/drivers/cpufreq/exynos-cpufreq.c
index 5e98c6b1f284b651f0b74d3673c55f997e47f081..82d2fbb20f7eb70d94a9c9c6e1d6ec3708f53ee0 100644 (file)
--- a/drivers/cpufreq/exynos-cpufreq.c
+++ b/drivers/cpufreq/exynos-cpufreq.c
@@ -159,7 +159,7 @@ static struct cpufreq_driver exynos_driver = {
 
 static int exynos_cpufreq_probe(struct platform_device *pdev)
 {
-       struct device_node *cpus, *np;
+       struct device_node *cpu0;
        int ret = -EINVAL;
 
        exynos_info = kzalloc(sizeof(*exynos_info), GFP_KERNEL);
@@ -206,28 +206,19 @@ static int exynos_cpufreq_probe(struct platform_device *pdev)
        if (ret)
                goto err_cpufreq_reg;
 
-       cpus = of_find_node_by_path("/cpus");
-       if (!cpus) {
-               pr_err("failed to find cpus node\n");
+       cpu0 = of_get_cpu_node(0, NULL);
+       if (!cpu0) {
+               pr_err("failed to find cpu0 node\n");
                return 0;
        }
 
-       np = of_get_next_child(cpus, NULL);
-       if (!np) {
-               pr_err("failed to find cpus child node\n");
-               of_node_put(cpus);
-               return 0;
-       }
-
-       if (of_find_property(np, "#cooling-cells", NULL)) {
-               cdev = of_cpufreq_cooling_register(np,
+       if (of_find_property(cpu0, "#cooling-cells", NULL)) {
+               cdev = of_cpufreq_cooling_register(cpu0,
                                                   cpu_present_mask);
                if (IS_ERR(cdev))
                        pr_err("running cpufreq without cooling device: %ld\n",
                               PTR_ERR(cdev));
        }
-       of_node_put(np);
-       of_node_put(cpus);
 
        return 0;